10,128 research outputs found
On the Optimal Linear Convergence Rate of a Generalized Proximal Point Algorithm
The proximal point algorithm (PPA) has been well studied in the literature.
In particular, its linear convergence rate has been studied by Rockafellar in
1976 under certain condition. We consider a generalized PPA in the generic
setting of finding a zero point of a maximal monotone operator, and show that
the condition proposed by Rockafellar can also sufficiently ensure the linear
convergence rate for this generalized PPA. Indeed we show that these linear
convergence rates are optimal. Both the exact and inexact versions of this
generalized PPA are discussed. The motivation to consider this generalized PPA
is that it includes as special cases the relaxed versions of some splitting
methods that are originated from PPA. Thus, linear convergence results of this
generalized PPA can be used to better understand the convergence of some widely
used algorithms in the literature. We focus on the particular convex
minimization context and specify Rockafellar's condition to see how to ensure
the linear convergence rate for some efficient numerical schemes, including the
classical augmented Lagrangian method proposed by Hensen and Powell in 1969 and
its relaxed version, the original alternating direction method of multipliers
(ADMM) by Glowinski and Marrocco in 1975 and its relaxed version (i.e., the
generalized ADMM by Eckstein and Bertsekas in 1992). Some refined conditions
weaker than existing ones are proposed in these particular contexts.Comment: 22 pages, 1 figur
Anti-dark and Mexican-hat solitons in the Sasa-Satsuma equation on the continuous wave background
In this letter, via the Darboux transformation method we construct new
analytic soliton solutions for the Sasa-Satsuma equation which describes the
femtosecond pulses propagation in a monomode fiber. We reveal that two
different types of femtosecond solitons, i.e., the anti-dark (AD) and
Mexican-hat (MH) solitons, can form on a continuous wave (CW) background, and
numerically study their stability under small initial perturbations. Different
from the common bright and dark solitons, the AD and MH solitons can exhibit
both the resonant and elastic interactions, as well as various
partially/completely inelastic interactions which are composed of such two
fundamental interactions. In addition, we find that the energy exchange between
some interacting soliton and the CW background may lead to one AD soliton
changing into an MH one, or one MH soliton into an AD one.Comment: 12 pages, 6 figure
Efficient Online Quantum Generative Adversarial Learning Algorithms with Applications
The exploration of quantum algorithms that possess quantum advantages is a
central topic in quantum computation and quantum information processing. One
potential candidate in this area is quantum generative adversarial learning
(QuGAL), which conceptually has exponential advantages over classical
adversarial networks. However, the corresponding learning algorithm remains
obscured. In this paper, we propose the first quantum generative adversarial
learning algorithm-- the quantum multiplicative matrix weight algorithm
(QMMW)-- which enables the efficient processing of fundamental tasks. The
computational complexity of QMMW is polynomially proportional to the number of
training rounds and logarithmically proportional to the input size. The core
concept of the proposed algorithm combines QuGAL with online learning. We
exploit the implementation of QuGAL with parameterized quantum circuits, and
numerical experiments for the task of entanglement test for pure state are
provided to support our claims
Pseudo-goldstino and electroweakinos via VBF processes at LHC
The multi-sector SUSY breaking predicts pseudo-goldstino which can couple to
the visible sector more strongly than the ordinary gavitino and thus induce the
decays of the lightest neutralino and chargino (collectively called
electroweakinos) inside the detector. In this note we study the electroweakino
pair productions via vector boson fusion (VBF) processes followed by decays to
pseudo-goldstino at the LHC. Our Monte Carlo simulations show that at the 14
TeV LHC with 3000 fb^{-1} luminosity the dominant production channel
pp->chargino+neutralino+2 jets can have a statistical significance above
2-sigma while other production channels are not accessible.Comment: Version in JHEP (comments added
Control, Conformity and Contradiction: Changes in Chinese Language and Literacy (Yuwen) Curriculum from 1980-2010 in China
Inspired by the researcher’s observations of and queries in the language curriculum as a practicing teacher for the past 20 years, this thesis addresses how the high school Chinese language and literacy (Yuwen) curriculum in China is controlled and directed by the social and political dominations from 1980 to 2010 and how the teachers and schools respond to the top-down curriculum change in their teaching practice. This research project fills a research gap of the lack of a systematic study of the Chinese language and literacy curriculum in Western scholarship by conducting an in-depth analysis of the relevant syllabuses, textbooks and teachers’ responses to the curriculum change in China. In doing so, this thesis attempts to achieve two theoretical implications: 1) A test of applicability of the existing literacy and other social theories originated in the Western developed countries to the Chinese context; 2) An empirical study that examines the data obtained in China with a view to enriching and complementing the existing literacy theories. This project is also expected to have impact on the policy makers in China and beyond, like in Australia and the USA where Chinese migrants and international students constitute a substantial learning population
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